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Phosphonated hyperbranched polybenzimidazole-polysiloxane block copolymer as well as preparation method and application thereof

A technology of polybenzimidazole block and polysiloxane block, which is applied in the field of phosphonated hyperbranched polybenzimidazole-polysiloxane block copolymer and its preparation, can solve phosphoric acid loss and proton conductivity drop and other issues

Active Publication Date: 2020-12-29
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The study found that the current benzimidazole polymers used as proton exchange membrane materials have the problems of obtaining higher proton conductivity under the condition of low phosphoric acid doping level and the decrease of proton conductivity caused by the loss of phosphoric acid.

Method used

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  • Phosphonated hyperbranched polybenzimidazole-polysiloxane block copolymer as well as preparation method and application thereof
  • Phosphonated hyperbranched polybenzimidazole-polysiloxane block copolymer as well as preparation method and application thereof
  • Phosphonated hyperbranched polybenzimidazole-polysiloxane block copolymer as well as preparation method and application thereof

Examples

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preparation example Construction

[0106] The present invention also provides a kind of preparation method of above-mentioned block copolymer, it comprises the steps:

[0107] The block copolymer is prepared by dissolving the partially phosphonated hyperbranched benzimidazole polymer containing carboxyl groups and the polysiloxane containing double-terminal amino groups in an organic solvent and reacting at high temperature.

[0108] Wherein, the reaction is carried out under the heating condition of 120-160° C. under the protection of inert gas; specifically, the reaction time is 6-15 hours.

[0109] Wherein, the organic solvent is one or more combinations of the following: DMF (N,N-dimethylformamide), DMAc (N,N-dimethylacetamide), DMSO (dimethylmethylene sulfone), NMP (N,N-dimethylpyrrolidone), polyphosphoric acid, methanesulfonic acid, TFA (trifluoroformic acidsulfonic acid), preferably DMF or DMAc.

[0110] Wherein, the molar ratio of the carboxyl-containing partially phosphonated hyperbranched benzimidazo...

Embodiment 1

[0153] (1) Add 378g of polyphosphoric acid (PPA) to a dry three-necked flask, then add 2.142g of 3,3-diaminobenzidine (DAB) and trimesic acid (BTA) at the same time in a molar ratio of 1:0.8 ) 1.68g, and the reaction solid content was 1.0%. The temperature was raised to 150°C and maintained in a nitrogen atmosphere for 3h, and then heated to 200°C for 8h.

[0154] (2) Lower the temperature of the above solution to 120°C, then add 0.80g of alendronic acid (the molar ratio to BTA is 0.4:1), raise the temperature to 190°C for 4 hours, then precipitate in deionized water, and Washing with deionized water multiple times to obtain carboxyl-containing partially phosphonated hyperbranched benzimidazole polymer LHBPBI;

[0155] Its structure is as described in formula (b):

[0156]

[0157] (3) Take 2.76g of LHBPBI (Mv=4.6kDa) from step (2) and dissolve it in DMAc (5wt%), then add 0.2g of double-terminal amino PDMS (shown in formula (a), Mn=10k, 0.02mmol) , and then inert gas arg...

Embodiment 2

[0163] (1) Same as Example 1, except adding 2.142g of DAB and 1.89g of BTA with a molar ratio of 1:0.9.

[0164] (2) Same as Example 1, except that 1.40 g of alendronic acid was added (the molar ratio to BTA was 0.62:1).

[0165] (3) Same as Example 1, 3.16g of LHBPBI (Mv=7.9kDa) from step (2) was dissolved in DMAc (5wt%), and then 0.34g of double-terminal amino PDMS (Mn=17k, 0.02mmol) was added.

[0166] After testing and calculation, the storage modulus of the polymer film not impregnated with phosphoric acid is 580MPa at 180°C, the ADL of the film impregnated with phosphoric acid is 10.20, the proton conductivity is 0.0814S / cm, and the proton conductivity per unit phosphoric acid doping level 0.00798S / cm, 0.0627S / cm proton conductivity after 10 immersions in deionized water, and 77.1% proton conductivity retention.

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Abstract

The invention relates to the field of block copolymers, in particular to a phosphonated hyperbranched polybenzimidazole-polysiloxane block copolymer as well as a preparation method and application thereof. The block copolymer has amphipathy, due to the fact that a soft segment of PDMS and a hard segment of LHBPBI are combined, a hydrophobic segment of PDMS and a hydrophilic segment of LHBPBI are combined to form a soft-hard and hydrophilic-hydrophobic phase separation structure, a proton transmission channel is constructed through the phase separation structure of the two chain segments, and in addition, the hyperbranched structure of LHBPBI can contain more phosphoric acid. And the hyperbranched structure of the LHBPBI contains a large amount of active end groups, so that a large amount of phosphonic acid can be introduced, and finally, the block copolymer with high proton conductivity (the highest proton conductivity can reach 0.0889 S / cm and the test temperature is 180 DEG C), highproton conductivity retention rate (the highest proton conductivity retention rate can reach 89.5%), high storage modulus (753 MPa and the test temperature is 180 DEG C) is obtained.

Description

technical field [0001] The invention relates to the field of block copolymers, in particular to a phosphonated hyperbranched polybenzimidazole-polysiloxane block copolymer and its preparation method and application. Background technique [0002] Benzimidazole polymers (PBIs) are polymers containing benzimidazole rings in the main chain structure, which have excellent physical and chemical properties such as chemical stability, thermal stability, flame retardancy and mechanical properties, and are widely used Used in high temperature resistant fabrics, fire retardant materials and filter materials for industrial products, etc. With the rise of fuel cell research, the commonly used perfluorosulfonic acid proton exchange membrane cannot meet the operation of fuel cells under high temperature and low humidity conditions due to defects such as the decrease of proton conductivity and mechanical properties under high temperature and low humidity conditions. Researchers began to lo...

Claims

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Application Information

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IPC IPC(8): C08G77/452C08G73/18H01M8/1037H01M8/1034H01M8/103H01M8/1072H01M8/124
CPCC08G77/452C08G73/18H01M8/1037H01M8/1034H01M8/103H01M8/1072H01M8/124Y02E60/50
Inventor 莫肇华李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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